CSS3 HSL - Saturation Value (Only)

[ReinnaNib]

I have a class called "button", I simply use it for all hover elements. Most of my buttons are black (background-color), and the .button:hover changes the background-color value of the items to gray.However, some of my buttons have random colors so they lose the effect when their background-color changes to light gray. for this reason, I would like to change the "satauration" value of the hovered item instead of modifying the whole color. That way, the hover effect will base on the base color..I was thinking... if it is possible to change the "saturation" value (only) of the background-color so that my hover effect will still be useful for random colors.